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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27aa5301e337658e5eb068871969cc63494d8b3dd69657920cffe81ca04d0704' 
  AND token = 'aYvcPI1CgqxK5X6xhxWbQ7EEq373Mc9Z2jqZ0Ab8ySg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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