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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd870d2a6282f180746af92c35f5d4ddcbb7167534ffa2b4ff32beb077abfbfc0' 
  AND token = 'ZwYwFeJy8opq/D6gk3lJ9lJa5NGS1eGTVjc13Z9bG/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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