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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c417484805f4e4aae08a430ef9130a7f2d0b108324668e9fba547ea515467c4a' 
  AND token = '4Ejzni3sbzCRjNIqYv1O1tD/Q3/GHk33PDMAZLw0d/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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