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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e9e1de94305db6c65dca609a4a0bb896f5725d9ecb71e31ef640ed0bc399031' 
  AND token = 'O4/zQHF9PupPGn7zZKb44PK5Lge0ROlFRgoQdPW3GLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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