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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '544244abc149a0358f1d27df0d87880e380e1a93394528fc0361afdc3e72f87e' 
  AND token = '4Z/WJdQ5siZDUlg/G0U6f5Kd7snnomouvmhGiZTaQvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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