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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '569f3b1fb13c05c75b363dacab1b36e26b18db2932fb056fbfea2aa8e8a4f435' 
  AND token = '2iaJUXd8mxgPwLfRQGIyDjIEZ+Bw3N6xNCbvG0U5EH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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