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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6259cf5a2a752adf600031e00c3488e6e5dc598dab4d6b65574b28051a796a47' 
  AND token = 'pYareLF+nravQK0B33kBguDFUazt3h0yEex/CRJzLYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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