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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a749ac0acfd932ca33dfb608636c9cc1eff1a82d66b0ed45a4416ea5baabfb48' 
  AND token = 'XaB40G57xRylzIB4KnpZ9m0eHE3mRzk2GQeir2fui8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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