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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddb34ffce60ca7ce596d6c50b9ce268eafd4baf27d0cb6a71b974e298446d35b' 
  AND token = 'm4gd8akFIJ1fxD1Kmymm3tFs2g6DME6gmiJOKKNI2Bk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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