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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3837e867b1b6c9e0c880598ef70ed6f82782f556197d4207eda2ea423187bc43' 
  AND token = 'O49F3oxMIC8bN4u4aJl1r7r29JxmsK66YpxEwQOBc1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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