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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd87bf7858926fd89bd3df7f904c22025404310e284dea0d18eae64465f45cbbf' 
  AND token = 'NA2XZHDhll7KNxfgwZgAcWaq5/4byFI/lRb3wf9wNlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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