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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efd445b7465564a5d44e1c5960718b6fcd8474969e617644902fc356edc09125' 
  AND token = 'djrQ5fx4OIPNa0TlaHQOEjfKJ0MklhxRet5bSHZ5lDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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