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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ce9bee3657e68a2551afcf4cabd5c8d8f2e8a17bb06e0e19cbb103f8faa2705' 
  AND token = '+yFfHmRMY+1otsq40y8EVycpLayNiwcaA5aKumx/hb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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