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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c6dc13277dffa7211889c2c793dadec026b1c8be4bfdfa7a3979726c0453e7c' 
  AND token = 'krQ5eP0ksCFzPTHtTnRroICISCjrv8bQfDlsYm9iX7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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