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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2113437429650e484c3adfa43c99f142145be66eebb340085067b63e1866e7bc' 
  AND token = 'TZV8j9g8kbdOoywQMdjJ0gmSbvml2R6qTeLdRboGBFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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