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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '844887c3f43f69732a299c0257781c5a3fa7fbe7bf9f59f5c2e111271a342c80' 
  AND token = 'y5dNZh+K94d5Tsl9WJCEU0ydErs/Z6OGXjtU0Ih8WPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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