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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e0346b8245519f5755db4abea3029ebc585ac4d021182c3b32d0693bddcddc6' 
  AND token = 'TWzPP6zQO7AbJfaTs9miCB/B9fvtjqhOmbk9bcKrE9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}