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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad8efca2d848c7912c3a47ec170e5a83a32691c3bb0272e11d4a872aa0125bc0' 
  AND token = 'gKBlEODD+PXQSJ+eHwnwozpBy4Yet9BKn7qJ+C03cfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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