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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3fa655bf74eeb53e388600a87eff824a4775e15eaa8c0fda01233b70975e1d6' 
  AND token = 'SfDj8tQV3o84gL+bh8gS50iVBsWd/gaSXLw4tRgEAbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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