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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8341afd988b513063f03a9447fbe0e07a75c623fb88ba322af3cfca552e22ef4' 
  AND token = 'm1/PN0KrwrjRD3aIFXKnIplGlJMj4JOMs+AQdGP+sZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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