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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db7623b7598af16d2f26b80b8a70cbbe0ff9f4fde327039a6fad9ba3aa3c2330' 
  AND token = 'g5C1G/wTkHI8iN9kClJ6tFUGcv6NG57IVJ9emBAAL1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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