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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9d99b36b7198b92bfa0a6848689acb7c3348acaddcd890bf7786db88d5abffe' 
  AND token = 'SmiqxXNEKOiYf/uKeMPKgaBraHbA1P2yH0zau7GrHSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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