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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00ec0435859331555e2c5f8ea62e78b407575457ee382d7bed431a62f167f216' 
  AND token = 'jtFnyaTLf0iA8CgvgIn985CAM9kaL5G15ZGBgjsPbYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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