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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '002ab9a44cac7243600b3d871423f160f58ec5fbedec0fb96965041685a957f2' 
  AND token = 'mJUF8ck9h0tiI+w4xalq9LNJXNpPabgbAZiq+HjMOhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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