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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cca8ea2a3c88459d635f0a97c1a7e93d5f39fc0d36a7bb2f592fa36c30f04f33' 
  AND token = 'HD8HqoJEDJqvW6sjJvsIViScKvzrdq97VLSmYVWKnjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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