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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e36f0a5e3299fa497c6f086ef76158d43ab69f9655f537e04e570ada371d81bd' 
  AND token = 'mSrdFpyMHaLp143ITS0F9IcP0GYrF/RSs7ebTVZGQFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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