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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa6bead33893239c49d4c327ede62f1511cd810a84f752608d4340dd2447afc5' 
  AND token = 'L7jNw7jmc9BphK/c7RyMMqaE52Q+/BkNin6XvOrLxa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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