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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8ee1306626554db5badcae2a4af0d0b7f18c025911c11004c1ccbc6f0efe0df' 
  AND token = 'D9FN5rlFi1W9Gg81ctBFTq0K1lrakWUf2u4MVsEXpjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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