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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93cfc5d7b833c19d443ea353d8f3f7154046ad0edfd5feb9cf392e3a9af33b5a' 
  AND token = '4vWJpaG6htdcjmvYfQDLv5iFxbb3iQx8p+RAlaqjy3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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