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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d95037c23c8a587a2dbca1567141e60a28a578b48ae0c66061d110bfd6d2f48' 
  AND token = 'z0XZH4MEiqIwc85eXT54wrtPLNaTTxIEj4bK52M8keM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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