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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd127fb4c04f140193c1b61646c0e40a400a72f57dcf0a9b4f288465d86eb008' 
  AND token = 'Npkk691pI0yvyCRkFz7cpXnN0PvS2kPr41neyw/JD3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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