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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01d5f4f58ad880944e105fa7dc8583f6370d54bf2da4d5d137c28f9f79d4a2ad' 
  AND token = '3meHGvkpIJeXnSP/p8TtYEE2z4UKhSmdYGDrf3FdKcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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