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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ced91b7bb580b4020a914bb14245c729f925c81dfb652ef75da2c34c02ae1c16' 
  AND token = '5LmlBSjKDv0MetPvctJDmcTiGxJiqXua+So8RrNHIXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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