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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '537efff1318b4c92071d8625efb605eb94e71f7c9ac6f3564ca854e0e7e78a07' 
  AND token = 'WcEIxFXEHW99qsst+IxiNHe8XtEOlFUhCkDqSWJHVOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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