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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ba5b44a81c48cadd404ae3d690a8d834e6077b411d034b457307f902988ad6a' 
  AND token = 'xZ/z8O9rdazfK6Ue+RX9s21+BaLr434k6hHFAVxun/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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