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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '023afda73f1d27fdd4f8e301921128d2c7dca73d36306481769ad3ccb5e1973e' 
  AND token = 'FPox0QX4W59L7BKwhOyp/HSUurwVsyRdH+Vdr17xrS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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