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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '592753212a40ada0631973d4f503242f900c6d06cc9e1affd345a4db0ce3fa30' 
  AND token = 'MzPhhZBoiD8h35iLH+6Kxg7g5l1Mp9RKRcONDXT82kQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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