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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6769f8e0c4e1489de38ef6f71a163607daa4beb5dfe7289467fb5b108b22c6d' 
  AND token = 'iRbKxFZsTFuiZTheCiWRI443hqG7z4svJ1TC0DMcAHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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