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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba2b69e3c9d3ca2e342f00f9d5db2380f03cf1936ec5c84b73ff89b5d8e6c872' 
  AND token = 'JiTOnK5i/vnM9T+N0DHPacMjz+MgfPkX9A8RnjGkPT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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