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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f377bd98110cc5acb6bd1f52e155efe649e7d50955ebe9dbbae31f10e5a9ed00' 
  AND token = 'IlDyYyZs8/gB0h02y0ii8pKbLD6S8U2j6zhCShPQD0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00076

JSON explain

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