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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b33fdc5e0494f01df12205694bc65138c0f6d1b800c42adb712b6ee451765c2' 
  AND token = 'WAWAKUV+Xx9xx96xO2JUkEpp5ObIScopFCctNiu59EE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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