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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f05ef006a84a8eef30786c8727306becdca35854808c46f9a61889c0252d86b' 
  AND token = 'QglYyVOhnCnXS01dtdiLaQSXd8PTVmBQE3tMFHizZX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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