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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a950ef996849bf782b347355ea563b2e2400383bc24915982ca93b0232fc993e' 
  AND token = 'Jcl5Lg28t79JK/a63b8RlBlziqlb6l8qBAOn1pkdGn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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