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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aab15d845b1380d750868313d692315ab2d8c8ce2e93b15a1ea70735a5a38ff7' 
  AND token = 'WVFLcYJFrsr5CiiYWVac9AwzTlbDBpJFmvwXNoLPYug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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