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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3091598b4081dd27afc7125f03b58d9ecdca7fe5ebda33cc91bce89b1a63659' 
  AND token = 'bqk8LbEUZBeILm+kB9gKl9DrLsVMl2Y5pIN9iZLEoZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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