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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '025d969880b07b9f4487601ec8626321e207796c3b901c4f8f6c51682622262f' 
  AND token = 'wfJo4aOmp4kYUA4++U+4rN0Z/kZQ9yYIX6wkVmQ8lxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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