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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba04fb87dce72d1d613d8c3a6e4fb611f7caf7755b5dc379152a5dd034b6d984' 
  AND token = 'sD5ozl896c20AlWWs2D9rwSBnuQ4ffGSqMZFUkwmPRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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