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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9cf1986e8c5fc241ff5d683176bcae19d1a7ad8d950503991bafbbd00ddb803' 
  AND token = 'Rj5U89DViVTFO0DnBvKClcFuaQr2iGj6FLelsg5hZKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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