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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e473aad1b295770d354c2e247b412cc02220b19d4353b73f4da98d94cf8d057b' 
  AND token = 'hE7FpRpeujxQ5wW/83GtHxxdwq50G7JY5hoQZK96QSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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