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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6695470f12d6effd977f4b80795f446a8fb22280fc6c609c51f125cc5d103b7d' 
  AND token = 'Tf06SzTlVlbRYHzq9GHnVssX1irjuYSXGoeOk240AA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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