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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67198569a2b9aeda75f81cb3ee689a66088ba41539ab4f3d9c8a28983df10a5c' 
  AND token = 't9LdVO6XviLgO9ym6sm/njwnmJOoyuKeesNjm0F4DHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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